Bridge-gate



(No Model.) 2 SheetsSheet 1.

G. MADSEN.

BRIDGE GATE.

Patenlsed 111113129, 1890.

(No Model.) 0 MADSEN 2 Sheets-Sheet 2. BRIDGE GATE.

No. 433,206. Patented July 29,1890.

m: norms PETERS cm, mom'mum, vusnmcwu, u. c.

UNITED STATES PATENT OFFICE.

CHRISTIAN MADSEN, OF CHICAGO, ILLINOIS.

BRIDGE-GATE.

SPECIFICATION forming part Of Letters Patent N0. 433,206, dated July 29, 1890.

Application filed May 17, 1890. Serial No. 352,215. (No model.)

gates at the ends of the bridge, so that they may rise and fall in guides. The gates are so combined with the bridge that when it is desired to close the roadway and swing the bridge the bridge-operator trips a latch and permits the gate to descend to within four or five feet of its closed position before the bridge begins to move. The swinging of the bridge then completes the lowering of the gate. \Vhen the bridge swings to its closed position, it automatically opens the gate.

In the accompanying drawings I have shown my invention in what I consider its best form.

Figure 1 is an elevation of a bridge and gates. Fig. 2 is a top view of same. Fig. 3 is an end view showing the gate and its operating mechanism on alarger scale. Fig. (3 is a top view of same. Figs. 4 and 5 are details.

1 is the bridge, which is adapted to swing upon its turn-table in the usual manner.

2 are guide-posts on the approaches-one at each side of the road wayconnected at the tops by a cross-beam or truss 4: is a gate-adapted to move up and down in suitable ways in the guide-posts.

5 is a trolley moving on a track on the top of cross beam 3. 6 is another trolley moving on a track on the lower side of beam 3.

7 are chains passing over pulleys 8 and connecting the two trolleys together, so that motion of one trolley causes the other one to move, but in the opposite direction.

9 is a chain connecting one end of the gate with the upper trolley 5. 10 is a chain connecting the other end of the gate with the lower trolley 6. Thus motion of the trolleys raises or lowers the gate, as the case may be.

11 is a spur carrying a friction-roller on trolley 5.

12 is a dog projecting down from trolley 6 and pivoted thereto, so as to swing freely in one direction, but not in the other, as shown in Figs. 4 and 5.

19 is a spring on trolley G to insure dog 12 standing vertically.

13 are spring-latches-one at each end of the bridge-mounted on suitable supports on the bridge and adapted to engage the spur 11 on trolley 5 and move the trolley as the bridge is swung into position, thus raising the gate.

14. are springs to project the latches 13 outwardly.

15 are cords attached to latches 13 and running toward the center of the bridge, thence over pulleys 16 and down to a drum 17, within reach of the bridge-operator. By winding up the cords 15 on the drum 17 the latches 13 are drawn back, releasing trolley 5, and the gate drops of its own weight.

18 are arms projecting from the bridge in position to engage dogs 12 on the lower trolley 6. IVhen the gate is dropped, by drawing back the latches 13 the trolleys are moved on their tracks by the chains 7, 9, and 10, until dog 12 strikes the arm 18, when the gate is arrested. The parts are so adjusted that this stoppage occurs when the gate is about five feet above the roadway, to prevent crushing any person or animal by the gate falling on them. The motion of the bridge in openin g, carrying the arm with it, permits the trolley 6 to move farther and lowers the gate gradually to its completely-closed position. hen the bridge swings around to close, the arm 18 raises dog 12 and passes without moving the trolley. The latch, however, engages spur 11 and raises the gate to its open position.

I claim- 1. The combination, substantially as set forth, with the vertically-moving gate and the swinging bridge, of a latch device connected to the bridge and adapted to engage and raise the gate, and a stop device operated by the bridge and adapted to arrest the downward motion of the gate when it is released by the latch and permit it to descend gradually as the bridge swings.

2. The combination, substantially as set forth, of the vertically-moving gate, the swinging bridge, the trolley 5, the latch 11 to engage said trolley, the trolley 6, the arm 18 to engage said trolley, and the chains connecting the trolleys and the gate.

CHRISTIAN MADSEN.

Witnesses:

WM. S. BATES, E. P. PIHL. 

